Check us out at http://www.tutorvista.com//videos Noise pollution (or environmental noise) is displeasing human, animal or machine-created sound that disrupts the activity or balance of human or animal life. The word noise comes from the Latin word nausea meaning seasickness. The source of most outdoor noise worldwide is transportation systems, including motor vehicle noise, aircraft noise and rail noise. Poor urban planning may give rise to noise pollution, since side-by-side industrial and residential buildings can result in noise pollution in the residential area. Other sources of indoor and outdoor noise pollution are car alarms, emergency service sirens, office equipment, factory machinery, fireworks, compressed air horns, construction work, groundskeeping equipment, barking dogs, appliances, power tools, lighting hum, audio entertainment systems, electric megaphones, and noisy people.